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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e724a3490a8716801fea24fe65a0b30e6a5f4b61bd1ecb5f6a37c7713735d307' 
  AND token = 'jARnY1tga64nHOtfbpq1+IS5H+AZlvpBQ09GWH+s5pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}